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net: cleanup and document skb fclone layout

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Lets use a proper structure to clearly document and implement
skb fast clones.

Then, we might experiment more easily alternative layouts.

This patch adds a new skb_fclone_busy() helper, used by tcp and xfrm,
to stop leaking of implementation details.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2014-09-29 13:29:15 -07:00
committed by David S. Miller
parent b248230c34
commit d0bf4a9e92
4 changed files with 47 additions and 28 deletions
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25
include/linux/skbuff.h
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@@ -781,6 +781,31 @@ struct sk_buff *alloc_skb_with_frags(unsigned long header_len,
int *errcode,
gfp_t gfp_mask);
/* Layout of fast clones : [skb1][skb2][fclone_ref] */
struct sk_buff_fclones {
struct sk_buff skb1;
struct sk_buff skb2;
atomic_t fclone_ref;
};
/**
* skb_fclone_busy - check if fclone is busy
* @skb: buffer
*
* Returns true is skb is a fast clone, and its clone is not freed.
*/
static inline bool skb_fclone_busy(const struct sk_buff *skb)
{
const struct sk_buff_fclones *fclones;
fclones = container_of(skb, struct sk_buff_fclones, skb1);
return skb->fclone == SKB_FCLONE_ORIG &&
fclones->skb2.fclone == SKB_FCLONE_CLONE;
}
static inline struct sk_buff *alloc_skb_fclone(unsigned int size,
gfp_t priority)
{